Attacks by the PKK Have Increased Over the Past Week, Undermining Peace Talks

ISTANBUL—Turkey said at least one soldier was killed in an attack by the outlawed Kurdistan Workers' Party, or PKK, as a recent surge in assaults threatens efforts to end the group's three-decade conflict with the Turkish government.

The assaults by the PKK—which is listed as a terrorist organization by Turkey, the European Union and the U.S.—have targeted Turkish security forces across four provinces in the country's east over the...